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The temperature indicates the physical quantity of the degree of heat and cold. It is generally expressed in degrees Celsius (°C). When the indoor temperature is between 17 °C and 27 °C, the human body feels most comfortable and is not prone to disease. The scientists set the lower limit temperature of "cold tolerance" and the upper limit of "heat tolerance" to 11 ° C and 32 ° C, respectively. When the indoor temperature is too high, it will affect the human body temperature regulation function, resulting in increased body temperature, vasodilation, pulse speed, and heart rate acceleration due to poor heat dissipation. If the temperature is too low, the room temperature will be too low, which will cause the skin blood vessels, sweat glands and sebaceous glands of the human body to contract, resulting in neuromodulation disorders, such as dizziness, fatigue, general malaise, lack of energy and decreased immune function.
People tend to go into two misunderstandings in indoor temperature. In winter, the heating is too hot and the temperature is too high. In summer, the air conditioning temperature is too low. The air conditioning in the summer is particularly low, resulting in excessive temperature difference between indoor and outdoor. The human body is difficult to adjust quickly, and it will produce a series of uncomfortable reactions. It is especially prone to colds, gastroenteritis, frozen shoulder, facial nerve palsy, etc. It is also a taboo for cardiovascular and cerebrovascular patients.
Song Guangsheng, director of the National Indoor Environmental Quality Inspection Center, said that the best and quickest way to cool down in summer is of course to open air conditioners. However, long-term air conditioning is not conducive to air circulation, nor does it meet the current requirements of “low carbon environmental protectionâ€. So, what other reasonable cooling methods?
First, reasonable opening and closing of doors and windows. Many people think that it is necessary to open the windows and doors in the summer to be cool, but it is not. During the daytime, the outdoor temperature is high, and the sun and hot air are coming indoors. If you open the doors and windows when it is cool in the morning and evening, let the air circulate, and close the doors and windows during the day, especially at noon, to isolate the hot air from the outside, and pull the light curtains to block the sunlight, so that the room can be cooler.
Second, the balcony, courtyard greening. Greening the balcony garden, planting trees and planting flowers not only has a high ornamental value, but also has the effect of regulating the microclimate, which makes the air fresh, cool and pleasant. Because the green plants can both shade and evaporate water through the leaves to achieve a cooling effect. According to some data, planting grapes, morning glory, creeper and some flowers and plants on the courtyard balcony can cool the attached wall surface by 5 °C - 14 °C, and reduce the indoor temperature by 2 °C - 4 °C.
Third, the indoor use of fans and water evaporation to cool. For example, after cleaning the floor with a wet mop, the ceiling fan is turned on to make the surface moisture evaporate and absorb heat; or a basin of cold water can be placed in front of the fan, and the fan can be turned on to evaporate the water, which can reduce the room temperature.
New standard for healthy homes: room temperature 17-27 degrees
Core Tip: WHO sets the standard for healthy housing: indoor temperatures should remain between 17 and 27 degrees Celsius throughout the year.